Step 4: Color Calibration

PixInsight
Linear Image Quality Enhancements

updated: 2026-03-30

Purpose	Calibrate the star and DSO colors using public star catalogs. This step was exchanged with the Noise Reduction step, as Color Calibration step increased the noise in the image again.
PixInsight Release:	newer than version 1.8.9-2 / build 1604
Input	The deconvoluted image from the previous step
Output	A color calibrated image
Previous Step	Step 3: Deconvolution
Alternatives	SPCC: Spectrophotometric Color Calibration PCC: Photometric Color Calibration SNCR Correcting the Tint Color Calibration The MARS Project GeneralizedHyperbolicStretch (GHS)
Next Steps	Step 5: Noise Reduction

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